Depends on the model, but the easiest place to check is behind the kick panel under the doors. If it's not there try removing the control cover, or you may have to pull the fridge out and remove the compressor cover. These are the 3 most common places for a defrost timer.

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niether. is there frost on back wall of freezer? if no look behind back wall and see if there is frost on all the coils when running. if less than 80% is frosty...freon. or is there frost covering back panel..if so then defrost problem would be correct. but side would be warm so I think not.